moody



y 9, 1962 J. L. MOODY 3,036,768

CALCULATING MACHINE Filed Dec. 29. 1958 4 Sheets-Sheet l 4 Sheets-Sheet 2 Filed Dec. 29, 1958 May 29, 1962 J. MOODY CALCULATING MACHINE 4 Sheets-Sheet 5 Filed Dec. 29, 1958 TIE EI May 29; 1962 J. L. MOODY $036,768

CALCULATING MACHINE Filed Dec. 29, 1958 4 Sheets-Sheet 4 United States Patent "cc 3,036,768 CALCULATING MACHINE John L. Moody, Oakland, Calif., assignor to Friden, Inc., a corporation of California Filed Dec. 29, 1958, Ser. No. 783,586 18 Claims. (Cl. 235-137) This invention relates to calculating machines and is more particularly concerned with an improved tenstransfer mechanism.

In many calculations, a manual setting of the register is desired. Inadvertently, the operator will set the register dials by rotating the dials from 9 to 0 in the positive direction or from 0 to 9 in the negative direction, thereby setting the tens-transfer mechanism in the next higher order of the register. When this occurs, the first machine cycle will operate the tens-transfer mechanism, and hence will result in an erroneous answer in the completed calculations. It is a general object of the invention, therefore, to provide an improved means to prevent such an error.

Further, most commercial calculating machines are provided with half-cent mechanisms in which, as part of a clearing operation, certain dials are reset to 5. A

few machines are provided with constant dividend mechanisms, such as illustrated by the patent issued to Harold J. Chall on November 24, 1953, No. 2,660,377, in which the accumulator register can be cleared to any predetermined setting. In each type of mechanism it is necessary to either disable the tens-transfer mechanism during the clearing operation or to clear back to 0 and then reset forwardly to the desired value in order to avoid setting the tens-transfer mechanismfor otherwise the first cycle of operation thereafter would cause an error. It is the primary purpose of the present invention to provide an improved tens-transfer mechanism which avoids these difficulties.

Another object of the invention is to provide a tenstransfer block in the full-cycle position of the machine whereby the register dials cannot be set positively beyond 9 or negatively beyond 0 (i.e., cannot be moved through the tens-transfer position) while the machine is at rest.

An object of a slightly modified embodiment of the invention is to provide a means whereby the register dials can be manually set in either a negative or a positive direction through the tens-transfer position without causing the tens-transfer mechanism to be conditioned for operation.

It is still another object of the invention to provide a positive, simultaneous restoration of the tens-transfer mechanism at the termination of the digitation phase.

Other objects and advantages of the invention will be apparent from the following description of two preferred embodiments of the invention as illustrated in the accompanying drawings in which:

FIG. 1 is a fragmentary, longitudinal, cross-sectional view through the machine showing the selection and actuating mechanism, and more particularly the tenstransfer mechanism of the present invention.

FIG. 2 is a view of the tens-transfer (single-tooth) actuators taken along a transverse, substantially vertical plane, as indicated by the line 22 of FIG. 1.

FIG. 3 is a view of the Geneva blocks and wheels taken along a plane immediately in front of that of FIG. 2, as indicated by the line 3-3 of FIG. 1.

FIG. 4 is a perspective view of the setting and latching members of the tens-transfer of the present invention.

:FIG. 5 is a plan view of a pair of tens-transfer actuators (mounted on a single shaft but which serve two orders of the register) showing the improved restore and latch- 3,036,768 Patented May 29, 1962 ing members and the relation of the full-cycle lock of the first embodiment of the present invention to these members.

FIG. 6 is a front view of the second embodiment of the present invention, taken on the same plane as that of FIG. 2, i.e., that indicated by the line 2-2 of FIG. 1.

FIG. 7 is a perspective view of the modified tens-transfer actuator and the latch block of this second embodiment.

FIG. 8 is a fragmentary side elevation of the second embodiment of the present invention.

GENERAL DESCRIPTION This invention is illustrated as embodied in the type of calculating machine disclosed in the Carl M. Friden Patent No. 2,229,889, issued January 28, 1941, and Carl M. Friden Patent No. 2,273,857, issued February 24, 1942.

The general arrangement and operation of such a standard Friden calculating machine is well-known and need not be described in detail. Such a machine is provided with a shiftable register carriage 20 (FIG. 1) mounted for endwise sliding movement on a rail 21 secured to a rear cross-member 49 and on a front cross piece 22 by means of rollers 23. The register carriage 20 serves to mount the counter dials 24 of the revolution counter mechanism, having an actuator 25 of suitable construction associated therewith. An ordinally arranged accumulator register, comprising the numeral wheels 26, individually mounted on dial shafts 27, is mounted in a carriage frame 28. Each order of the accumulator, or product register, is driven, or actuated, through a pinion drive gear 39 secured to the lower end of each dial shaft 27, which gear is engageable with suitable plus-minus gearing of spool gear 29 slidably but nonrotatably mounted on a square shaft 30. A pair of selection gears 36, also slidably and nonrotatably mounted on each square shaft 30, are operable to receive coacting selection slides 57. Differential increments of movement of slides 57 bear a predetermined differential relationship to the numerical value of an amount key 32 which has been depressed in that order. Hence, the step teeth of the associated actuating cylinder 31, secured on shaft 48, unidirectionally rotate coacting square shafts 30 to an extent controlled by the coordinal row of numeral keys 32 comprising each order of the keyboard. The sign character of registration on the accumulator dials 26 is controlled by shifting of the plus-minus gear spool 29 for selective driving engagement of one or the other of its gears with the pinion gear 39. The plus-minus spool 29 is under control of a strap, or gate, 33 positioned between its gears. This strap is mounted on suitable upright arms 34 rigidly mounted on a transverse rockable shaft 35 arranged to be controlled in any convenient manner in performing the calculation operations as by manual depression of the usual plus or minus key (not shown).

Accumulator Tens-Transfer Mechanism Secured to the lower end of each of the dial shafts 27 is a tens-transfer cam 41, which is arranged to cooperate with a tens-transfer lever 42. This tens-transfer lever is pivotally mounted on a stud 43 secured to the lower surface of carriage frame 28. Each lever is provided at its free end with a downwardly depending lug 44 which lies between a pair of flanges 49 provided on the hub 45 of a tens-transfer gear 46 located in the next higher order of the machine. The single tooth, or tens-transfer, cam'41 rocks the associated tens-transfer lever 42 by engagement with a cam projection (not shown) whenever the coordinal accumulator numeral wheel 26 passes from 0 to 9 or from 9 to 0, thereby causing the lug 44 to move the tens-transfer gear 46, in the next higher order, forwardly into the path of a single tooth tens-transfer actuator 47 or 47-a. These tens-transfer actuators 47,

47-11 are carried by the power-driven shafts 48, which carry the stepped actuator drums 31. The above portion of the tens-transfer mechanism is identical to that shown and described in the above-mentioned patents. It is well known, in machines of this type, for the tens-transfer actuators to engage their respective tens-transfer gears after the actuator 31 of that order has terminated engagement with the coordinal selection gear 36. That is, the machine, in each order operates in each cycle through two phases: a digitation phase during which the actuator 31 can be engaged with the respective selection gear 36; and a subsequent tens-transfer phase during which the tenstransfer actuator 47, 47-11 will engage its respective gear 46 (if the gear has been displaced forwardly to its tenstransfer position). It is also well known in machines of this type, for the respective phases to be progressively staggered from the lower to the higher orders,.i.e., from right to left. The new embodiment of my invention will now be described as it differs in construction in respect to the above-mentioned patents.

In the machine of the aforementioned Friden patents, it is possible to manually rotate the numeral wheels 26 through the 9 to positions in either direction, whereby the tens-transfer will be conditioned in the next higher order, and will be operated in the next cycle of the machine and hence cause an erroneous registration. To prevent this occurrence, the present invention employs, in one embodiment, a stud to block the tens-transfer levers in their home, or full-cycle, position, thus preventing the numeral wheels 26 from being rotated through a tenstransfer, or 9 to 0 position. This block preferably consists of a square stud 50 carried by the tens-transfer actuator 47a, and shown in blocking arrangement with a restore lever 51 which is held between the flanges 49 of the tens-transfer gear 46, as will be described hereinafter. The restore arm 51 is pivoted at its lower end on a short pin 83 held by a bracket 53 which is secured by a suitable means, such as screws 52, to a cross-plate 54 that extends transversely of the machine. This arm has at its upper end a laterally bent ear 55 that extends between the flanges 49 of the hub 45 of the tens-transfer gear 46. Forwardly of the ear 55, the restore arm has a cam nose 58 extending through a notch provided in the upper edge of the cross plate 54. A suitable resilient means, such as tension spring 56, seated in a spring seat, or aperture, located intermediate the vertical length of arm 51, urges arm 51 and tens-transfer gear 46 rearwardly to their inoperative position. A U-shaped latch lever 60 is pivoted on one angle to a transverse shaft 61 positioned at the apex of a comb 62 which extends transversely of the machine. One arm 63 of U-shaped lever 60 extends forwardly from the pivot shaft 61 and is provided with a latching shoulder 64 normally underlying the car 55 of the restore arm 51. Latch arm 60 also is provided with a lower and forwardly extending arm 65 that extends through the lower portion of the cross plate 54. The front edge of this arm is provided with a cam nose 66 which is utilized to effect arelease movement of the latching lever 60, as will be explained shortly. One restore arm 51 and latch 69 is provided for each order of the machine and is formed, as seen in FIG. 4, to have the upper and lower cam noses 58 and 66, previously mentioned, in vertical alignment. The spring 56 is secured between the arm 51 and the latch arm 60 intermediate their lengths. The spring has a twofold purpose, to urge the latch nose 64 of latch arm 60 against the underside of the ear 55 of the restore arm 51, and to restore the arm 51 and the tens-transfer gear 46 at the termination of the digitation phase when the latch arm 64 is released, as will now be described.

An ear 70 extending rearwardly from the rear face of the single-tooth tens-transfer gear 47a of each actuator assembly is formed with a cam surface on its leading edge, as seen in FIG. 5. This cam ear is so located on the actuator that, at the completion of the tens-transfer phase in that order, it will cam the noses 66 of the respective latches 60* rearwardly, thereby moving the latch nose 64 from the ear 55 of restore arm 51. Thereupon spring 56 will return the arm 51 and the tens-transfer gear '46 to its inactive position. With the above description, it can readily be seen that the operator will be unable to rotate the dial 26 through the tens-transfer position by virtue of cam nose 58 of arm 51 abutting blocking stud 50. Only after the initial angular movement of the actuator shaft 48- and its actuator assembly can a tenstransfer gear be shifted on its shaft 30 to condition the tens-transfer mechanism for operation. However, as soon as stud 50 is rotated away from in front of cam noses 58, and before digitation from the engagement of actuators 31 with their respective gear 36 can commence, the tens transfer gear can be moved to operative position. Thus during the ensuing digitation phase, when an accumulator dial '26 passes from 0 to 9 or from 9 to 0, the tens-transfer lever 42 can translate tens-transfer gear 46 in the next higher order, forwardly into the path of the single-tooth tens-transfer actuators 47, 47-a carried by the power-driven shafts 48. The forward movement of the tens-transfer gear 46 and spool 45 will carry the re store arm 51 forwardly, so that the latch nose 64 of the latch arm 60 will be urged by spring 56 to move upwardly behind the ear 55 and thus latch the restore arm 51 in its forward latched position. This will hold the transfer gears 46 in the planes of the respective single-toothed tens-transfer actuators 47, 47-a. The rotation of the actuator shaft 48 by the usual power means will, by virtue of the tenstransfer actuators 47, 47-a, rotate the forwardly positioned tens-transfer gears 46 one unit, or increment, in either an additive or a subtractive direction in the next higher order, depending upon the meshing of the gears 29 and 30, as explained above. 7

As shown in FIGS. 2 and 3, a transverse cross-sectional view of the tens-transfer actuators shows the staggered relationship of the single tens-transfer actuator teeth 47 to provide for the wave effect of both digitation and tenstransfers usual in this type of machine. I

It can be seen in FIG. 2 that while two tens-transfer actuators 47, 47-a are shown on shaft 48 at the right of the view, only one such transfer actuator, i.e., actuator 47, is necessary, as no transfer occurs into the units order. It will also be seen that the successive pairs of actuators 47, 47-11 on the remaining actuating shafts 48 are spacedapart equal angular distances. This will provide a successive operation of the tens-transfer actuators from the lowest to the highest order. While the trailing actuator 47a, which serves the lower of each pair of orders, appears to follow the higher order actuator 47 by a considerable angular distance, it actually engages its respective tens-transfer gear before that actuator 47 can engage its respective gear so that appearance to the contrary notwithstanding, the tens-transfer proceeds as a wave from the lowest to the highest order.

Means are provided for preventing the overthrow of the numeral wheels 26 at the end of an actuation. For this purpose the two sets of stepped teeth of each actuator cylinder 31 are located with their last active, or trailing, teeth in alignment, as shown in FIG. 1. There is associatedwith each square shaft 30 a Geneva block 75 having ten locking surfaces to cooperate with the teeth 73 and 74 of the respective Geneva wheel 72. A more complete description of the above Geneva wheel blocks can be had in the above-mentioned Carl M. Friden Patent No. 2,273,857, but it can be noted that tooth 73 of the Geneva wheel will engage one of the surfaces of the associated block 75 to stop overthrow of square shaft 30 at the end of the digitation phase; an interdental space 77 (FIG. 3) then permits rotation of square shaft 30 transfer phase.

A modification of the above mechanism can be seen in FIGS. 6, 7 and 8, whereby an operator will be able to manually revolve the register dials in either a negative or a positive direction, in the full-cycle position of the machine, through the tens-transfer position without causing an error in the following machine cycle. 'In this embodiment the tens-transfer gears 4-6 and associated restore arms 51 are free to move, but the latches 60 are disabled in the full-cycle position of the machine.

The modification differs only slightly in mechanical aspects. As seen in FIG. 8, which view shows the fullcycle position of the mechanism, the block 5% of the mechanism of FIG. 1 is omitted. Consequently upper cam nose 58 is not used and can also be omitted. A new block 80 is secured to the rear tens-transfer actuator 4'7-a and lies in blocking opposition with the lower cam noses 66 of the latch arms 60. With this arrangement, numeral dials 26- can be manually adjusted in the full-cycle position of the machine. Referring to FIG. 8, if, for example, the operator adjusted the numeral dials 26 in a negative direction through 0, the tens-transfer lever 42 in the next higher order is tipped off. The tenstr-ansfer gear 46 will be moved forward to be in the plane with its tens-transfer actuator 47, 47-a. However, due to the block 80 being in engagement with the cam noses 66 of the latch lever 60, the latch lever 60 will be unable to move sufiiciently upward to latch arm 51, thereby spring 56 will return restore arm 51 and tens-transfer gears 46 to their inactive position before the actuator shaft 4-8 is actuated. Only after the beginning of the cycling of the actuator shaft 48 can the normal tenstransfer be latched for its digitation cycle.

Referring to FIGS. 6 to 8, it is seen that the same mechanical structure of the first form of tens-transfer actuator teeth has been maintained, 'with the sole exception of replacing the block 80 for block 56-. The block 80 is pinned to the rearward tens-transfer actuator 47-a, as viewed in FIG. 8, by any suitable fastening means, such as rivets 76 (FIG. 7). The angular position of the block 80 is identical on each actuator shaft 48 as shown in FIG. 6. Block 80' is provided with a bent cam portion 81 (FIG. 7), the purpose of which is to cam noses 66 rearwardly and thereby rotate the latch arms 60 counterclockwise about their pivots 61, thus removing the latch nose 64 from the ear 55. The restoration of the tenstransfer gears 46 will occur simultaneously at about the 355 point of the cycle.

I claim:

1. In a calculating machine, a first accumulator wheel having a tens-transfer cam, a second accumulator Wheel, drive means for driving said calculating machine and defining a normal rest position thereof, a pair of coacting movable latch members each of which is biased into a position for latching the other and movable from that latching position against its bias for freeing the other member, whereby said latch members are operable to latch each other alternatively for providing two different latched positions of said pair, a tens-transfer member connected to and movable with one latch member of said pair, said tens-transfer member having an operative position corresponding to one latched position of said pair in which it is operable to cause a tens-transfer to be entered into said second accumulator wheel, said tens-transfer member having also an inoperative position corresponding to the other latched position of said pair of latch members, said tens-transfer cam being operable to move one of said latch members for changing said pair from said other to said one latched position for moving said tens-transfer member to its operative position, and blocking means effective when the machine is in its normal rest position for blocking one latch member of said pair against such cam-initiated movement.

2. The combination of claim 1 wherein said tenstransfer cam and said blocking means act on the same latch member.

3. The combination of claim 1 wherein said tenstransfer cam is operable to move one of said latch members, and said blocking means blocks the other of said latch members.

4. The combination of claim 1 wherein said blocking means blocks the latch member to which said tenstransfer member is connected.

5. The combination of claim 1 wherein said tenstransfer member is connected to and movable with one of said latch members, and said blocking means blocks the other of said latch members.

6. In a calculating machine, a first accumulator wheel having a tens-transfer cam, a second accumulator wheel, a tens-transfer member operable for causing a tens-transfer to be entered into said second accumulator wheel, said tens-transfer member being movable between a set, operative position and a normal, inoperative position, a latch member movable to a latching position in which it latches said tens-transfer member in one of its two positions, means for biasing said latch member to its latching position, said latch member having also a non-latching, tensioned, position in which it leaves said tens-transfer member free to move between said operative and inoperative positions thereof, means for biasing said tenstransfer member out of the position in which it can be latched and toward the other position, said position in which said tens-transfer member can be latched being a tensioned position thereof, drive means for driving said machine and defining a normal rest position thereof, said tens-transfer cam on said first accumulator wheel being operable during operation of the machine, at its 9 to 0 position to move one of said members against its bias means, and into its tensioned position for thereby causing a tens-transfer to be entered into said second accumulator wheel, and blocking means eifective when the machine is in its normal rest position for blocking said one member against movement by said tens-transfer cam.

7. In a calculating machine, a first accumulator wheel having a tens-transfer cam, a second accumulator wheel, a tens-transfer member operable for causing a tens-transfer to be entered into said second accumulator Wheel, said tens-transfer member being movable between a set, operative position and a normal, inoperative position, a latch member movable to a latching position in which it latches said tens-transfer member in one of its two positions, means for biasing said latch member to its latching position, said latch member having also a non-latching, tensioned, position in which it leaves said tens-transfer member free to move between said operative and inoperative positions thereof, means for biasing said tens-transfer member out of the position in which it can be latched and toward the other position, said position in which said tens-transfer member can be latched being a tensioned position thereof, drive means for driving said machine and defining a normal rest position thereof, said tenstransfer cam on said first accumulator wheel being operable during operation of the machine, at its 9 to 0 position to move one of said members against its bias means, and into its tensioned position for thereby causing a tens-transfer to be entered into said second accumulator Wheel, and blocking means effective when the machine is in its normal rest position for blocking the other member in its tensioned position.

8. In a calculating machine, a first accumulator wheel having a tens-transfer cam, a second accumulator wheel, a tens-transfer member operable for causing a tens-transfer to be entered into said second accumulator wheel, said tens-transfer member being movable between a set, operative position and a normal, inoperative position, a latch ember movable to a latching position in which it latches said tens-transfer member in one of its two positions, means for biasing said latch member to its latching position, said latch member having also a non-latching, tensioned, position in which it leaves said tens-transfer member free to move between said operative and inoperative positions thereof, means for biasing said tens-transfer member out of the position in which it can be latched and toward the other position, said position in which said tenstransfer member can be latched being a tensioned position thereof, drive means for driving said machine and defining a normal rest position thereof, said tens-transfer cam on said first accumulator wheel being operable during operation of the machine, at its 9 to position to move one of said members against its bias means, and into its t-ensioned position for thereby causing a tens-transfer to be entered into said second accumulator wheel, and blocking means effective when the machine is in its normal rest position for blocking said tens-transfer member in its normal, inoperative position.

9. In a calculating machine, a first accumulator wheel having a tens-transfer cam, a second accumulator wheel, drive means for driving said machine and defining a normal rest position thereof, a tens-transfer member biased to a normal, inoperative position and movable by said tens-transfer cam from said normal position to a set, operative position, an actuator for driving said tens-transfer member for effecting a tens-transfer in said second accumulator wheel, when said tens-transfer member is in its operative position, a latch member biased to an operative position for holding said tens-transfer member in its operative position, releasing means connected to said actuator for releasing said latch member, and blocking means effective when said machine is in its normal rest position for blocking one of said members in an inoperative position.

10. The combination of claim 9, wherein said blocking means is effective for blocking said tens-transfer member in its normal, inoperative position when said machine is in its normal rest postion.

11. The combination of claim 9 wherein said blocking means is effective for blocking said latch member in its inoperative, non-latching position when said machine is in its normal rest position.

12. In a calculating machine having a register including independently rotatable dial assemblies each having a tens-transfer cam, a normally inoperative tens-transfer member in each higher order, means operated by said cam in the adjacent lower order for moving each said member to its operative position, and actuators for driving said members to eifect a tens-transfer, an improved mechanism comprising latching means effective to latch said tens-transfer member in its operative position, a resilient means to bias said tens-transfer members to their inoperative positions, blocking means to block operation of said latch means when the machine is at rest, and releasing means connected to said actuators for releasing said latch means.

13. In a calculating machine having a register including independently rotatable dial assemblies each having a tens-transfer cam, a normally inoperative tens-transfer member in each higher order, means operated by said cam in the adjacent lower order for moving each said member to its operative position, and actuators for driving said members to effect a tens-transfer, an improved mechanism comprising latching means effective to latch said tens-transfer member in its operative position, a resilient means to bias said tens-transfer members to their inoperative positions, blocking means to block said tens-transfer member in its inoperative position when the machine is at rest, and releasing means connected to said actuators for releasing said latch means.

14. In a calculating machine having an ordinal register including independently rotatable dial assemblies each having a tens-transfer cam, means including ordinal shafts for differentially driving said dial assemblies, tenstransfer levers pivotally mounted respectively adjacent each said dial assembly and each rocked by the said tens-transfer cam of the associated said dial assembly when said dial assembly turns through its ten-transfer position in either direction, normally inoperative tenstransfer gears slidably mounted on said shafts adjusted to an operative position by the transfer lever associated with the adjacent lower order dial assembly, and cyclic actuators for driving said gears to eifect'a tens-transfer, an improved mechanism comprising a latch effective to latch said tens-transfer gear in its operative position, a resilient means to bias said tens-transfer gear to its inoperative position, an actuator restore means for releasing said latch to restore said ten-transfer gear to its inoperative position, blocking means to block operation of said latch means when the machine is at rest.

15. In a calculating machine having an ordinal register including independently rotatable dial assemblies each having a tens-transfer cam, means including ordinal shafts for differentially driving said'dial assemblies, tenstransfer levers pivotally mounted respectively adjacent each said dial assembly and each rocked about its pivotal connection by the said tens-transfer cam of the associated said dial assembly when said dial assembly turns through its 9 to 0 position in either direction, normally inoperative tens-transfer gears slidably but nonrotatably mounted on said shafts, said gears being adjusted to an operative position by their respective levers, and a cyclically operated actuator for each of said tenstransfer gears for driving said gears one unit rotational movement for each operation of said actuator, an improved mechanism comprising a latch for each said tenstransfer gear to latch said gear in its operative position, a resiliently operated restore arm for each said tenstransfer gear to restore said ten-transfer gear to its inoperative position, a latch releasing means associated with each said cyclic actuator to unlatch said tens-transfer latch, and blocking means to block said tens-transfer gear for retaining it in its operative position when the machine is at rest.

16. In a calculating machine having an ordinal register including independently rotatable dial assemblies each having a tens-transfer cam, means including ordinal shafts for differentially driving said dial assemblies, tenstransfer levers pivotally mounted respectively adjacent each said dial assembly and each rocked about its pivotal connection by the said tens-transfer cam of the associated dial assembly when said dial assembly turns through its tens-transfer position, normally inoperative tens-transfer gears slidably but nonrotatably mounted on said shafts, said gears being adjusted to an operative position by their respective levers, and an actuator for each of said tens-transfer gears, the combination comprising an ordinal latch for each tens-transfer gear to latch said gear in its operative position, resilient means biasing each said tens-transfer gear to its inoperative position, means associated with each said actuator to move said tens-transfer latch for unlatching said gear, and blocking means to block said latch in unlatching position when the machine is at rest.

17. In a calculating machine having an ordinal reg ister including independently rotatable dial assemblies each having a tens-transfer cam, means including, ordinal shafts for differentially driving said dial assemblies, ordinally arranged tens-transfer levers pivotally mounted respectively adjacent each said dial assembly and each rocked about its pivotal connection by the said tenstransfer earn of the ordinally related dial assembly 'when said dial assembly turns through its 9 to 0 position in either direction, normally inoperative tens-transfer gears slidably but nonrotatably mounted on said ordinal shafts, said gears being adjusted to an operative position by their respective levers, and an actuator for each of said tens-transfer gears operative in the operative position of said gears, the combination comprising an ordinal latch for each tens-transfer gear to latch said gear in its operative position, an ordinal resilient means for biasing each said tens-transfer gear to its inoperative position, an unlatching means operable in timed, relation to each of said cyclic actuator to delatch the respective tenstransfer latch, and blocking means to block said tenstransfer gear in its inoperative position when the machine is at rest.

18. In a cyclically operable calculating machine having an ordinal register including independently rotatable dial assemblies each having a tens-transfer cam, means including driving shafts for differentially driving said dial assemblies, power driven actuating means for differentially driving the respective shafts during a digitation phase of a machine cycle, normally inoperative tens-transfer gears slidably but nonrotatably mounted on said driving shafts, interordinal transfer members each operated by the said tens-transfer cam of the adjacent lower order dial assembly when said dial assembly turns through its tens-transfer or 9 to 0' position in either direction and operable to adjust to an operative position the tensadvance the tens-transfer gears in their operative positions a single value increment, the combination comprising an ordinal latch for each tens-transfer gear to latch said gear in its operative position, resilient means for biasing each tens-transfer gear to its inoperative position, a cam connected to each said tens-transfer actuator to unlatch said tens-transfer latch at the completion of the said tens-transfer phase of a cycle, and means for preventing the latching of a said tens-transfer gear in its 10 operative position When the machine is at rest.

References Cited in the file of this patent UNITED STATES PATENTS 1,853,053 Horton Apr. 12, 1932 2,273,857 Friden Feb. 24, 1942 2,360,704 Moody Oct. 17, 1944 2,660,377 Chall Nov. 24, 1953 2,797,869 Grobl July 2, 1957 Patent No. 3,036,768

May 29, 1962 John L. Moody that error appears in the above numbered pat- Patent should read as It is hereby certified that the said Letters ent requiring correction and corrected below.

Column 2, line 24, for "revolution column 4, line 15, for "gear" read gears line 54, for "that" read the column 5, line 22, for "tipped" read tripped column 8, line 34, for "operative" read inoperative Signed and sealed this 5th day of February 1963.

(SEAL) Attest:

ERNEST w. SWIDER DAVID LADD Commissioner of Patents Attesting Officer read revolutions 

